Opposite words for flaw :
" One of these has got a flaw, and it's cloudy," he mumbled. "The Further Adventures of Jimmie Dale", Frank L. Packard.
I know not why the manoeuvres of Miss Flaw especially attracted me that evening, but I leaned out across Miss Marks and I caught Miss Flaw's eye. "Father and Son", Edmund Gosse.
There must have been a flaw somewhere. "The Mayor of Warwick", Herbert M. Hopkins.
There is not the smallest flaw in the will. "The Scarlet Feather", Houghton Townley.